Two-Axis Magnetic Sensor for Tire Rotation Detection
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Solution Overview
Problem
Tire pressure monitoring systems face challenges in accurately detecting tire rotation due to the limitations of Hall magnetic sensors and installation angle variability, leading to inaccurate state control and increased power consumption.
Innovation Solution
A two-axis planar magnetic sensor measures magnetic field intensities in two perpendicular directions to accurately detect tire rotation, allowing the controller to adjust the operating state based on the variation of these intensities, thereby reducing power consumption and improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Hall magnetic sensor is used to detect tire rotation, then the device can monitor tire state, but the detection accuracy is reduced due to installation angle variability
Solution Approach 1:
The patent transitions from using a single-axis Hall magnetic sensor to a two-axis planar magnetic sensor, adding a second measurement dimension. This allows the system to detect magnetic field variations in both X and Y directions simultaneously, enabling accurate tire rotation detection regardless of installation angle variations through coordinate transformation algorithms.
Solution Approach 2:
The patent changes the measurement parameters by detecting magnetic field intensities in two perpendicular directions rather than one. By measuring both Bx and By components and applying mathematical transformations, the system compensates for installation angle variations and maintains high detection accuracy across different mounting orientations.
2Reliability
If the tire pressure monitoring device operates continuously to ensure real-time monitoring, then safety is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by controlling the microcontroller to enter sleep mode after detecting tire rotation, waking up only when needed to perform measurements and transmissions. This periodic operation pattern maintains real-time monitoring capability while significantly reducing average power consumption compared to continuous operation.
Solution Approach 2:
The system uses feedback from the magnetic sensor to detect tire rotation events and adjusts its operation accordingly. When rotation is detected, the system activates to perform measurements and transmit data; when no rotation occurs, it enters low-power sleep mode, optimizing the balance between monitoring reliability and power consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables accurate detection of tire rotation and state control, reducing power consumption and prolonging the service life of tire pressure monitoring devices by using a two-axis magnetic sensor to account for installation angle variability and improve real-time performance.
Implementation Method 1
a two-axis planar magnetic sensor measures magnetic field intensities in two perpendicular directions to accurately detect tire rotation
Data Source
AI summary
A tire pressure monitoring device can include: a magnetic sensor configured to measure a first magnetic field intensity in a first direction, and to measure second magnetic field intensity in a second direction; and a controller configured to control a state of the tire pressure monitoring device based on a variation of the first magnetic field intensity and a variation of the second magnetic field intensity.